Defect detection on curved screen surface

With the rapid development of touch screen technology and technology, more and more electronic products are transitioning from keyboard operation to touch screen operation. A variety of touch screens are being used in general, and among them, curved screens are difficult to manufacture and more complicated. Therefore, this curved screen has more stringent quality control requirements. Long-term screening by large-scale production line workers alone can no longer meet the needs of production capacity. In addition, manual inspection under strong light for a long time not only misses the detection rate and errors. The high inspection rate will also have a certain impact on workers' health products. Therefore, visual inspection has great positive significance here.

Xinwei Vision has accumulated a wealth of experience because it has done a lot of mature cases in the inspection of mobile phone product parts before. Some time ago successfully cooperated with automation manufacturers to implement a defect detection visual solution for curved mobile phone screens.

Curved screen pit detection

Surface pits, black spots sample one

Curved screen pit and black spot detection

Sample of pits and black spots

Edge chipped sample Partial enlarged view of chipped sample

Edge chipping sample 2 Enlarged image of chipping sample

Surface scratches

Surface scratch sample three

During the visual inspection of the screen samples, we found that the effect or contrast of the defects of different features is different. In order to improve the detection rate of multiple types of defects and reduce the type of hardware used (mainly the type of light source), we do A lot of analysis and testing work, relying on the company's rich imaging products, also developed a special light source, to ensure that in the same set of environments, one-step inspection of multiple products with different defect characteristics, false detection rate, over inspection The rate is guaranteed within a certain range. At present, the product has been used on the customer's production line.